It was definitely a cargo transfer mission. I accepted, they gave me cargo, and I delivered it to the destination. I was not late at all, only took about 5-10 minutes to deliver. I did not incur any bounties, did not break any laws, followed all docking procedures. And I'm pretty sure I finished with less credits than I started with. Very weird.
I'm going to have to run a few more missions, and take screenshots before, during, and after the mission... if I run into more issues, I guess I'll have to submit a ticket or something.